<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="app" @click="handleClick">
        {{msg.slice(0,3)}}
    </div>
    <script>
        var vm = new Vue({
            el:"#app",
            data:{
                msg:"hello"
            },
            methods:{
                handleClick(){
                    // console.log(this.msg)
                    /* vue中获取data中的数据，直接获取，不需要加data */
                    // console.log(this.$data.msg)//点 hello

                    /* 小程序中改变data中的数据 */
                    this.msg = "change"
                }
            }
        })
        // console.log(vm.$data.msg)//hellO
    </script>
</body>
</html>